From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2EB58353EF7; Sun, 21 Jun 2026 13:04:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782047044; cv=none; b=JFML1jEjjqCthm8wRrMNbjqBdZ+U7nZ08Rww2S+PMUsn58GOY1C3mz/YvW9UWoricHpHymiAOFrCf2hGhdL6mf0+0VFPDwHvX8Kq+fbOv0Xka2kFA1ibEO1FyWQJlvTzcMc3bRrHBFvtd13hu3/AzPSGZ0FqAR5YFGRzPKg4v40= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782047044; c=relaxed/simple; bh=XZ3QL+ViFIRQLIm9wDhWdL0BX/Xy+P2cyftFjHpTXuA=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=PqRq1doZBelpHlgMvrHNJcJ27i330RbGyxSJedTLGtO3VO1kd+V7QE1TJyu9qAfhtGz6FYqxPkfAjXJLjBihClKx7VzwMJY1FR+LxvW2rEQ5uOq5JMwLYi3aQE0ftyZE9VsQ8BnDNP/5jlXngRL6vgTfrVlSvg4Usz0DaX6Pxd4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Fov1mXvD; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Fov1mXvD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 436C81F000E9; Sun, 21 Jun 2026 13:03:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782047042; bh=XZ3QL+ViFIRQLIm9wDhWdL0BX/Xy+P2cyftFjHpTXuA=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=Fov1mXvDuGCK2T8sN6e2OfQHKCECHfbpGXRBBqt0mJumjJ/lQbWWgN+HJ+/A1VLw+ e5YBQ183dvuJj8bkhkLpBwxFrOxwQLVALwfGN8E1vAdvSrax2YUe76xVCjK7uPwOFi 8L8TB9EiAaEyP+6x5OTgJet8aZiHBkKPALBPE4+VYsqKVHMeJsBx9VwREe4epBtPeP n9K1YBwfMVRT70tbP5fJHUITXTsn/07OQJHxOY03KDzngCMaGRvGI98OxNWNIGSt1/ pUwueEV4G7f1R4ZCP/PbFKS6BI+0tZTyLgw9UhMTaK5YsTglkNBetTBg7DaYsXC78p S9lKpmXhld3Cw== Date: Sun, 21 Jun 2026 09:03:53 -0400 From: Steven Rostedt To: David Laight Cc: Thomas Gleixner , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Linus Torvalds , Sebastian Andrzej Siewior , John Ogness , Peter Zijlstra , Julia Lawall , Yury Norov , linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, dri-devel@lists.freedesktop.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-rdma@vger.kernel.org, linux-usb@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nfs@vger.kernel.org, kvm@vger.kernel.org, intel-gfx@lists.freedesktop.org Subject: Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h Message-ID: <20260621090353.24772584@fedora> In-Reply-To: <20260621135531.243375d9@pumpkin> References: <20260621093430.264983361@kernel.org> <20260621093811.168514984@kernel.org> <87ik7cmcb7.ffs@fw13> <20260621135531.243375d9@pumpkin> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sun, 21 Jun 2026 13:55:31 +0100 David Laight wrote: > Indeed... > Isn't trace_printk() just an extern? > Having it defined somewhere isn't going to make any difference to build times. No it is not. It is a macro to cut as many nanoseconds as possible as trace_printk() was created to debug tight race conditions and any added latency can make the race go away. -- Steve